18481379 has 6 divisors (see below), whose sum is σ = 21498804. Its totient is φ = 15841140.

The previous prime is 18481369. The next prime is 18481391. The reversal of 18481379 is 97318481.

It is not a de Polignac number, because 18481379 - 2¹⁶ = 18415843 is a prime.

It is a super-2 number, since 2×18481379² = 683122739483282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18481369) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 188537 + ... + 188634.

It is an arithmetic number, because the mean of its divisors is an integer number (3583134).

Almost surely, 2^18481379 is an apocalyptic number.

18481379 is a deficient number, since it is larger than the sum of its proper divisors (3017425).

18481379 is an equidigital number, since it uses as much as digits as its factorization.

18481379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377185 (or 377178 counting only the distinct ones).

The product of its digits is 48384, while the sum is 41.

The square root of 18481379 is about 4298.9974412646. The cubic root of 18481379 is about 264.3898576936.

The spelling of 18481379 in words is "eighteen million, four hundred eighty-one thousand, three hundred seventy-nine".